ok kids have got a 12ft pool, its about 6,000 ltrs it takes a LONG time to heat (outside tap is on hotwater system) ive had a madcap idea that im going to try and build over the week and im looking for views/advice/derisment the current idea is - i have an old unused bbq that i ussually burn old paperwork in. i have several old lengths of hose, and can get hold of some copper piping the current idea is length of hose over side of pool, going to a drill pump (attached to smallish 6v or 3.7v motor), another length of hose going into about 1.5m of copper tubing, this copper tubing will be coiled inside of the closed lid of the old bbq, this then feeds out converting to another length of hose connected to the water inlet valve on the pool the idea is that the water will be drawn out of 1 tube, fed through the piping inside the hot bbq, then fed back in through the standered inlet so as to heat that bit faster namely seen as the pool heater advertised as ok for this pool is 4kw and would eat electric and i have several old bags of charcoal/coal hanging around to use up the current idea for joining hosepipe to copper pipe is - 12mm copper pipe, 12mm internal diamiter of hosepipe, smear copper pipe in rubber solution and insert into hosepipe and pray a seal is made any improvements on this idea would be welcome idea 2 is the same as idea one but with a copper pipe going around the outside of the pool with several holes drilled in to let hot water into several areas idea 3 is a small airfan on the base of the bbq to feed air in and get closed bbq alot hotter again help guidance or simply pure fear would help